find lines in another file based on contents in a second file


 
Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers find lines in another file based on contents in a second file
# 1  
Old 11-17-2011
Question find lines in another file based on contents in a second file

Hello,

I have a file with tab delimited columns like:

File1
Code:
A    2    C    R
F    4    D    Q
C    9    A    B
......

I want to grep out the lines in a second file, File2, corresponding to each line in File1

Can I do this:

Code:
while read a b c d
do
grep '$a\t$b\t$c\t$d' File2 >> Results
done < File1

Or is there a more efficient way to achieve the same results?

Thanks for your input!
~Guss
Moderator's Comments:
Mod Comment
Please use code tags when posting data and code samples!

Last edited by vgersh99; 11-17-2011 at 08:02 PM.. Reason: code tags, please!
# 2  
Old 11-17-2011
Code:
grep -f file1 file2
# OR (depending on the actual content of your file1)
fgrep -f file1 file2

# 3  
Old 11-17-2011
Hi vgersh99,

Thanks for your reply. The code works, however, since I have several thousand rows in both file1 as well as file2, this will take a long time.

~Guss
 
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

awk to change contents of field based on condition in same file

In the awk below I am trying to copy the entire contents of $6 there may be multiple values seperated by a ;, to $8, if $8 is . (lines 1 and 3 are examples). If that condition $8 is not . (line2 is an example) then that line is skipped and printed as is. The awk does execute but prints the output... (3 Replies)
Discussion started by: cmccabe
3 Replies

2. Shell Programming and Scripting

Find all lines in file such that each word on that line appears in at least n lines of the file

I have a file where every line includes four expressions with a caret in the middle (plus some other "words" or fields, always separated by spaces). I would like to extract from this file, all those lines such that each of the four expressions containing a caret appears in at least four different... (9 Replies)
Discussion started by: uncleMonty
9 Replies

3. UNIX for Beginners Questions & Answers

UNIX utility to find difference in folder, file and contents of file against a base version

Hi, I am trying to find out whether there are any Unix utilities that compares folders, files and contents within the file and provides a comprehensive report. The comparison can be against base version of a folder and file with content. Can you please let me know of such a utility? Thanks,... (6 Replies)
Discussion started by: Sripathi_ks
6 Replies

4. Shell Programming and Scripting

Remove or rename based on contents of file

I am trying to use the two files shown below to either remove or rename contents in one of those files. If in file1.txt $5 matches $5 of file2.txt and the value in $1 of file1.txt is not "No Match" then that value is substituted for all values in $5 and $1 of file2.txt. If however in $1 ... (5 Replies)
Discussion started by: cmccabe
5 Replies

5. Shell Programming and Scripting

File comparison based on contents

Hi I have 2 files 1.del ---- 1,2,3,4,5 1,2,3,4,4 1,1,1,1,2 2.del ---- 1,2,3,4,5 1, 1,2,3,4,4 1,1,1,1,2 I need to compare the above two files in unix, as in the output should only tell the difference in contents as I should get only the line 1 ( from 2.del) , rest all lines are... (4 Replies)
Discussion started by: Ethen561
4 Replies

6. UNIX for Dummies Questions & Answers

count values based on contents of another file

Hello, I have two files as shown below: test1 678 679 689 690 710 test2 1 678 654 800 676 791 689 900 I want to get a count of lines from test2 whose columns bound the values in test1 I tried running the code below; however am getting wrong results. (3 Replies)
Discussion started by: Gussifinknottle
3 Replies

7. Shell Programming and Scripting

Execution problem with sort the file based on contents

My input file: >ali ASSDDGHFHFHJFJHJDSDGSDGSDGSDGSDGSDGSDGDSGDSGSDGDSGSDGSDGDSGSDGGDSG >zzz ASdASDASDSADSADDSADJKHJDSADKLJADKLSAJDLJLKJLDASDDSADd >abu ASDASDFSAFASFSADFASDASDSADSADSADSADSADSADASDASdSADSADSADA >aaa... (2 Replies)
Discussion started by: patrick87
2 Replies

8. Shell Programming and Scripting

How can i delete the contents of one file based on another file

Hi all, I have two log files A and B. Where files A have 10 lines and file b has 5 lines. Out of them 3 lines are common to both of them. I want to compare both the files and want to delete the common data from file A(file B should remain as it is) example : file A : 1 2 3 4... (5 Replies)
Discussion started by: rdhanek
5 Replies

9. Shell Programming and Scripting

Remove lines based on contents of another file

So, this issue is driving me nuts! I was hoping to get a lending hand here... I have 2 files: file1.txt contains: this is example1 this is example2 this is example3 this is example4 this is example5 file2.txt contains: example3 example5 Basically, I need a script or command to... (4 Replies)
Discussion started by: bashshadow1979
4 Replies

10. Shell Programming and Scripting

sh script that reads/writes based upon contents of a file

Hi everyone, Ive got a quick question about the feasibility and any suggestions for a shell script. I can use sh or ksh, doesnt matter. Basically, Ive got an output file from a db2 command that looks like so: SCHEMA NAME CARD LEAF ELEAF LVLS ISIZE NDEL KEYS F4 F5 ... (3 Replies)
Discussion started by: rdudejr
3 Replies
Login or Register to Ask a Question

Featured Tech Videos